The city’s port welcomes thousands of ships a year, including some of the biggest cruise liners and container ships in the world.

The vessels leave their engines running while docked to power their electrics, but elsewhere in the world ships use a shore-based electricity supply, virtually eliminating their emissions.

Port Director Alastair Welch has said the port does not monitor its own air pollution, but this is about to change

Cargo and cruise ships, including the Queen Mary 2 and Britannia which regularly dock in Southampton, use the method – just not when visiting the British port.

Port Director Alastair Welch from ABP said: “The challenge has been in particular there is no one standard for shore power. I’d like it in place as soon as possible.

“I should emphasise shore power is not the only answer and that’s why we’re working with solar power and hybrid ships now, because all of them have a part to play for the future.”

A review of Air Quality in Southampton in 2015 by the local authority showed the port is believed to contribute between seven and 23 per cent of the air pollution, while cars contribute 18 per cent and HGVs 12 per cent.

The government has since told Southampton to implement clean air zones by 2020 and the council is implementing a Clean Air Strategy to meet national goals.

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